• Eastbound Route 50 at North Pershing Drive (detour at North Barton Street or Washington Boulevard)

• Columbia Pike between South Orme Street and the Pentagon

• South Joyce Street from Army Navy Drive to Columbia Pike

• Ramp from westbound Washington Boulevard to westbound Columbia Pike

• Ramp from westbound Washington Boulevard to eastbound Columbia Pike

8:30 p.m. to midnight:

• Fort Myer Drive from Wilson Boulevard to the North Meade Street bridge. Access to the Fort Myer Heights neighborhood will be from the Rhodes Street bridge. Employees requiring access to the Pentagon should enter South Parking from Army-Navy Drive or North Parking from Boundary Channel Drive.

Robert Thomson is The Washington Post’s “Dr. Gridlock.” He answers travelers’ questions, listens to their complaints and shares their pain on the roads, trains and buses in the Washington region.